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Finding the Fourth Proportional to 89.93, 134.69 and 87.90

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Solution

The fourth proportional to 89.93, 134.69 and 87.90 is: 131.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.93 : 134.69 = 87.90 : x
  2. Step 2: Convert to fraction form
    89.93/134.69 = 87.90/x
  3. Step 3: Cross multiply
    89.93x = 134.69 × 87.90
  4. Step 4: Simplify right side
    89.93x = 11,839.37
  5. Step 5: Solve for x
    x = 11,839.37/89.93
  6. Step 6: Final answer
    x = 131.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.